Is this a bug report?

Yes

Have you read the Contributing Guidelines?

Yes

Environment

Environment:
OS: macOS High Sierra 10.13.2
Node: 8.9.2
Yarn: Not Found
npm: 5.5.1
Watchman: Not Found
Xcode: Xcode 9.2 Build version 9C40b
Android Studio: 3.0 AI-171.4408382

Packages: (wanted => installed)
react: 16.0.0-beta.5 => 16.0.0-beta.5
react-native: 0.50.3 => 0.50.3

Target Platform: iOS (8.0)

Steps to Reproduce

1. Paste below code in your index.js

componentDidMount() {
        if(Platform.OS === 'ios') {
	       console.log(" ios") 
        } else {
              console.log("android") 
       } 
}

2. Enable Remote JS Debugging and check the Console for log

Expected Behavior

Console Log Output: ios

Actual Behavior

Console Log Output:

Simulator Output:

checkInitialPermissions is the function to be executed only on android. But its executed on iOS.

Reproducible Demo

Follow steps to reproduce